1. National Center for Posttraumatic Stress Disorder, Palo Alto Health Care System, Department of Veterans Affairs, Menlo Park, California,
2. Department of Psychology and Counseling, Pittsburgh State University, Pittsburgh, Pennsylvania
3. Palo Alto Health Care System, Department of Veterans Affairs, Menlo Park, California
4. Palo Alto Health Care System, Department of Veterans Affairs, Menlo Park, California, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California